Sometimes it is difficult to determine who is paired with whom within the
Siamese unit. From a 1/4 Box (see the left-most diagram below),
dancersandare often tricked into thinking they are part of a Tandem unit when
in fact they are part of an As Couples unit.
Also, the dancersandare often tricked into thinking they are working in a Tandem
unit with dancersand(respectively).